It's pretty simple.
They played great defense, didn't make stupid mistakes and they had a clutch QB. Usually 2/3 will win you the game in the NFL, so having all three made them damn tough to beat. Brady didn't have anything to do with the defense and Bill didn't have anything to do with the clutch QB, but they both were great at preventing the team from making bone-headed mental gaffes that many other teams do repeatedly.
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